I finally got myself sorted and took my head off to a workshop and had it done. It's back with new guides, valves, and a couple of inserts on the two really bad seats.

This afternoon I put all the springs on and then stood in the garage talking to my dad for about an hour, and making a list of all the bits and bobs I have to sort out before rebuilding the engine.Need to get on and get stuff ordered now and get the garage clear so I can bring the tractor in. It's going to get cold in there soon :s